netdev - Re: [PATCH net-next v4 1/2] net: dsa: microchip: ksz8: Make flow control, speed, and duplex on CPU port configurable

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Message-ID: <20230520045623.GB18246@pengutronix.de>
Date: Sat, 20 May 2023 06:56:23 +0200
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Vladimir Oltean <olteanv@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>, Andrew Lunn <andrew@...n.ch>,
	Eric Dumazet <edumazet@...gle.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Woojung Huh <woojung.huh@...rochip.com>,
	Arun Ramadoss <arun.ramadoss@...rochip.com>,
	"Russell King (Oracle)" <linux@...linux.org.uk>,
	Simon Horman <simon.horman@...igine.com>, kernel@...gutronix.de,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH net-next v4 1/2] net: dsa: microchip: ksz8: Make flow
 control, speed, and duplex on CPU port configurable

On Sat, May 20, 2023 at 02:28:02AM +0300, Vladimir Oltean wrote:
> > +	/* This hardware only supports SPEED_10 and SPEED_100. For SPEED_10
> > +	 * we need to set the SW_10_MBIT bit. Otherwise, we can leave it 0.
> > +	 */
> > +	if (speed == SPEED_10)
> > +		ctrl |= SW_10_MBIT;
> > +
> > +	ksz_rmw8(dev, REG_SW_CTRL_4, SW_HALF_DUPLEX | SW_FLOW_CTRL |
> > +		 SW_10_MBIT, ctrl);
> 
> REG_SW_CTRL_4 ... S_REPLACE_VID_CTRL ... dev->info->regs[P_XMII_CTRL_1] ...
> at some point we will need one more consolidation effort here, since we
> have at least 3 ways of reaching the same register.

Agree, the register access is a bit messy now. Your idea about the
regfield API sounds good. We should try it.

Should i convert this patch to use dev->info->regs?

> >  	.mirror_del = ksz8_port_mirror_del,
> >  	.get_caps = ksz8_get_caps,
> > +	.phylink_mac_link_up = ksz8_phylink_mac_link_up,
> 
> Another future consolidation to consider: since all ksz_dev_ops now
> provide .phylink_mac_link_up(), the "if" condition here is no longer
> necessary:
> 
> static void ksz_phylink_mac_link_up(struct dsa_switch *ds, int port,
> 				    unsigned int mode,
> 				    phy_interface_t interface,
> 				    struct phy_device *phydev, int speed,
> 				    int duplex, bool tx_pause, bool rx_pause)
> {
> 	struct ksz_device *dev = ds->priv;
> 
> 	if (dev->dev_ops->phylink_mac_link_up)
> 		dev->dev_ops->phylink_mac_link_up(dev, port, mode, interface,
> 						  phydev, speed, duplex,
> 						  tx_pause, rx_pause);
> }
> 
> which reminds me of the fact that I also had a patch to remove
> dev->dev_ops->phylink_mac_config():
> https://patchwork.kernel.org/project/netdevbpf/patch/20230316161250.3286055-5-vladimir.oltean@nxp.com/
> 
> I give up with that patch set now, since there's zero reviewer interest.
> If you want and you think it's useful, you might want to adapt it for
> KSZ8873.

Sounds good. I'll take it in to my mainlining queue for KSZ8873.

> >  	.config_cpu_port = ksz8_config_cpu_port,
> >  	.enable_stp_addr = ksz8_enable_stp_addr,
> >  	.reset = ksz8_reset_switch,
> > -- 
> > 2.39.2
> > 
> 
> Reviewed-by: Vladimir Oltean <olteanv@...il.com>
> 

Regards,
Oleksij
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